The Photofile series, as maintained by Schoonover, consists of negatives primarily taken on research trips for Schoonover's artwork and illustrations. These images are identified by place or by subject. The series includes images of Bushkill, Pennsylvania, and various natural scenery from other Pennsylvania locations, some taken on camping trips. Delaware locations are also represented such as Old Drawyer Church in Middletown, Old College in Newark, Rehoboth, Schoonover's Franklin St. studio, the Delaware River, and houses in Milford. Also included are negatives taken during research for muckraking articles for which Schoonover contributed illustration. Such images include anthracite coal mills near Scranton, Pennsylvania in 1903 taken for the article, "Children of the Coal Shadows," by Francis H. Nichols; a 1903 trip to New York City for the article, "The Waifs of the Street," by Ernest C. Poole; a 1906 trip to the western United States for an article on the Juvenile Court system written by Lincoln Steffens; and Italian immigrants traveling in steerage on the ship, Konigin Luise, in 1908 or 1909. There are also images taken on Frank and Martha Schoonover's honeymoon in Louisiana and Cuba and Irénée du Pont's residence, Xanadu, in Cuba taken circa 1931. Images identified by subject include schooners, yachts, river boats, ships, shad fishing, various trees, horses, autumn scenes, corn shucks, swamps and marshes, splatter docks, buildings and houses, cattle, costumes, flower gardens, ice on ponds, Indianapolis/Mississippi steamers, horse-drawn vehicles, and fishing at Maskenozha and Mast Hope. Others include "Gypsies;" logging camps; American Indians; a train wreck; lineman on pole; Ephrata Cloisters; Jamaica; and Barataria, Louisiana.